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Acute Sauna & HRV (N=1 Data)

A single sauna session causes a brief HRV rebound above baseline ~30 min post-session, followed by overnight suppression. Regular use produces positive chronic adaptation.

N=1 Evidence

Single Session

  • FreddyFit94: Single 15-min sauna session
  • LordOfTheSmartRings: Three rounds ~100°C traditional Finnish sauna
  • Marco Altini: HRV briefly rose above baseline ~30 min post-sauna, then fell overnight

Pattern

Acute: brief parasympathetic rebound → overnight suppression. Chronic: positive adaptation with regular use.

Evidence